Examples of java.nio.channels.DatagramChannel.receive()

java.nio.channels.DatagramChannel.receive()
Get a datagram from this channel.
This method transfers the datagram from the channel into the target byte buffer and return the address of the datagram, if the datagram is available or will be available as this channel is in blocking mode. This method returns null if the datagram is not available now and the channel is in non-blocking mode. The transfer start at the current position of the buffer, and the residual part of the datagram will be ignored if there is no efficient remaining in the buffer to store the datagram.

This method can be called at any moment, and will block if there is another thread started a read operation on the channel.

This method just execute the same security checks as the receive method of the DatagramSocket class.
@param target The byte buffer to store the received datagram. @return Address of the datagram if the transfer is performed, or null ifthe channel is in non-blocking mode and the datagrama are unavailable. @throws ClosedChannelException If the channel is already closed. @throws AsynchronousCloseException If the channel is closed by another thread while this method is in operation. @throws ClosedByInterruptException If another thread interrupts the calling thread while the operation is in progress. The calling thread will have the interrupt state set, and the channel will be closed. @throws SecurityException If there is a security manager, and the address is not permitted to access. @throws IOException Some other IO error occurred.

              }
            } break;


            case 1: {
              if (inKey.isReadable()) {
                expect(in.receive(inBuffer).equals(OutAddress));
                if (! inBuffer.hasRemaining()) {
                  expect(equal(inBuffer.array(),
                               inBuffer.arrayOffset(),
                               Message,
                               0,

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        ByteBuf buffer = alloc().directBuffer(config().getReceivePacketSize());
        boolean free = true;
        try {
            ByteBuffer data = buffer.nioBuffer(buffer.writerIndex(), buffer.writableBytes());


            InetSocketAddress remoteAddress = (InetSocketAddress) ch.receive(data);
            if (remoteAddress == null) {
                return 0;
            }
            buf.add(new DatagramPacket(buffer.writerIndex(buffer.writerIndex() + data.position()), remoteAddress));
            free = false;

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                //do we have at least one package?
                if ( reader.hasPackage() ) break;
            }
        } else if (channel instanceof DatagramChannel) {
            DatagramChannel dchannel = (DatagramChannel)channel;
            saddr = dchannel.receive(buffer);
            buffer.flip();      // make buffer readable
            if ( buffer.hasArray() )
                reader.append(buffer.array(),0,buffer.limit()-buffer.position(),false);
            else
                reader.append(buffer,buffer.limit()-buffer.position(),false);

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        boolean failure = true;
        SocketAddress remoteAddress = null;
        try {
            // Receive from the channel in a non blocking mode. We have already been notified that
            // the channel is ready to receive.
            remoteAddress = nioChannel.receive(byteBuffer);
            failure = false;
        } catch (ClosedChannelException e) {
            // Can happen, and does not need a user attention.
        } catch (Throwable t) {
            fireExceptionCaught(channel, t);

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              return;
            }
            if (key.isReadable()) {
              ByteBuffer readBuffer = byteBufferAllocator.allocate();
              try {
                InetSocketAddress from = (InetSocketAddress) channel.receive(readBuffer);
                if (from == null) {
                  try {
                    channel.close();
                  } catch (IOException ee) {
                  }

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    private IRubyObject doReceive(Ruby runtime, int length, ReceiveTuple tuple) throws IOException {
        DatagramChannel channel = (DatagramChannel)getChannel();


        ByteBuffer buf = ByteBuffer.allocate(length);


        InetSocketAddress sender = (InetSocketAddress)channel.receive(buf);


        if (sender == null) {
            // noblocking receive
            throw runtime.newErrnoEAGAINReadableError("recvfrom(2) would block");
        }

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                //do we have at least one package?
                if ( reader.hasPackage() ) break;
            }
        } else if (channel instanceof DatagramChannel) {
            DatagramChannel dchannel = (DatagramChannel)channel;
            saddr = dchannel.receive(buffer);
            buffer.flip();      // make buffer readable
            if ( buffer.hasArray() )
                reader.append(buffer.array(),0,buffer.limit()-buffer.position(),false);
            else
                reader.append(buffer,buffer.limit()-buffer.position(),false);

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                //do we have at least one package?
                if ( reader.hasPackage() ) break;
            }
        } else if (channel instanceof DatagramChannel) {
            DatagramChannel dchannel = (DatagramChannel)channel;
            saddr = dchannel.receive(buffer);
            buffer.flip();      // make buffer readable
            if ( buffer.hasArray() )
                reader.append(buffer.array(),0,buffer.limit()-buffer.position(),false);
            else
                reader.append(buffer,buffer.limit()-buffer.position(),false);

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        ByteBuf data = allocHandle.allocate(config.getAllocator());
        boolean free = true;
        try {
            ByteBuffer nioData = data.internalNioBuffer(data.writerIndex(), data.writableBytes());
            int pos = nioData.position();
            InetSocketAddress remoteAddress = (InetSocketAddress) ch.receive(nioData);
            if (remoteAddress == null) {
                return 0;
            }


            int readBytes = nioData.position() - pos;

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                //do we have at least one package?
                if ( reader.hasPackage() ) break;
            }
        } else if (channel instanceof DatagramChannel) {
            DatagramChannel dchannel = (DatagramChannel)channel;
            saddr = dchannel.receive(buffer);
            buffer.flip();      // make buffer readable
            if ( buffer.hasArray() )
                reader.append(buffer.array(),0,buffer.limit()-buffer.position(),false);
            else
                reader.append(buffer,buffer.limit()-buffer.position(),false);

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